Transformer Fundamentals Video Notes - Fill-in-the-Blank Flashcards

Fill-in-the-blank flashcards covering transformer basics, components, safety, and testing.

A transformer changes voltage using its __, defined by the ratio of the number of turns on the primary to the secondary.

turns ratio

The aluminum busbar that sends low voltage out of the transformer is the __.

low voltage lead

Aluminum is used for the __ side of a transformer.

low voltage

Copper is used for the __ windings (the high voltage side) of a transformer.

high voltage

The coil and core are secured together with metal __.

strapping

The glue that bonds the layers in the transformer is __ glue.

epoxy

The transformer is filled with mineral oil and a vacuum is drawn to help the oil __ throughout the coil and core.

disperse

An internal fault detector will alert maintenance if there's a __.

short circuit

The device that protects the transformer from lightning surges is a __ arrestor.

surge

H1 and H2 are high‑voltage bushings; the side connected to the case ground is __.

H2

The secondary bushings are labeled X1, X2, X3; X2 is the __ (neutral).

neutral

The voltage on the neutral relative to ground is expected to be __.

0

The fuse cutout's safety handle is the CSP, which stands for __.

Completely Protected

Back feeding a step‑down transformer with a generator can turn it into a(n) __ transformer.

step-up

KVA stands for __ and represents the transformer’s capacity.

kilovolt-amps

A 7,200 V primary with a 120 V secondary (one hot leg) yields a turns ratio of __ to 1.

60:1

The polarity when reading X1-X2-X3 left-to-right as 3-2-1 is __ (additive).

additive

Read as 1-2-3 on the secondary, the polarity is __ (subtractive).

subtractive

PCB oil presence is detected by a blue dot or a __ kit used to test the oil.

CSI

The Extendo stick is used to operate the transformer from the ground, typically to switch off the __.

fuse cutout

A transformer is tested with a simulated lightning strike of __ volts before service.

145,000

Pulling a meter disconnects a customer from the power grid and is known as __ a meter.

pulling